P0432: Catalyst 2 Efficiency Below Threshold Bank 2
What to do
Driveable, will fail an emissions test.
What this code means
The main under-floor converter on bank 2 is not meeting its efficiency threshold — the counterpart of P0422. As with the bank 1 code, tapping the converter body and listening for a rattling substrate is a free first test, and comparing the bank 2 monitor value against bank 1 narrows the fault to that side or to the whole engine.
Likely causes
Start here
- Failed catalytic converter · specialist
- Aged or lazy downstream oxygen sensor · easy
- Exhaust leak before the sensor · moderate
Less common
- Broken or collapsed converter substrate · specialist
- Converter poisoned by oil or coolant consumption · specialist
Symptoms
Components involved
Information, not instruction
CarGeek is a reference, not a service manual. Its pages are written from public sources and from what other people have found, never from a manufacturer's own service information, so they can be wrong or incomplete for your particular vehicle. Some of what they describe carries real risk: high voltage, fuel under pressure, stored energy, hot and moving parts.
Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
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What makes one worth reading:
- The car — make, model, year and engine. The same fault behaves differently on each.
- What you measured, not only what you replaced.
- What actually fixed it — or that nothing did, which is worth knowing too.
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